Improvement in iviagic lanterns



2 Sheets--Sheet 2.

L.. Ma gic Lantern.

M A BOY.

Patented May 4,1875.

THEGRAPHIC COJHOTOrLlTH-SQAEM PARK PLAGLNAY.

STATES LORENZO J. MARGY, OF PHILADELPHIA, PENNSYLVANIA.

Specification forming part of Letters Patent No. 162,759, da ed May 4,1875; application filed May 31, 1873.

To all whom it may concern Beit known that I, LORENZO J AMES MARCY, ofPhiladelphia, Pennsylvania, have invented certain Improvements in MagicLanterns, of which the following is a specification:

The inventions herein setforth constitute improvements on the magiclantern heretofore patented to me April 28, 1868, and July 6, 1869.Obviously, however, some of these improvements may be used without theothers, and in lanterns differing in their details from the constructiontherein shown.

The object of the first part of my invention is to enable the operatorto vary the coloring and shading of the pictures, and this I do bycombining with the lantern slides of colored glass to be moved acrossthe line of light. I also use an opaque flap to darken the field. Myinventions further relate to improvements on the lamp, on the means forholding the lenses, and on the devices for protecting the front glass ofthe frame-chamber from the heat of the lamp. The nature, scope, andsubject-matter of these improvements are hereinafter fully set forth.

In the accompanying drawings of my improved apparatus, Figure 1 shows avertical longitudinal section, and Fig. 2 a similar transverse onethereof.

A boxshaped base, A, having air-holes a in its sides, supports a tubularouter case, B, by

means of connecting side flaps b, as set forth in my patent of July 6,1869. The inner case 0 is secured near its bottom to the outer one bynarrow side strips 0, to leave room for the air to circulate between thetwo cases. An open box, B, forms a part of the outer case. The chimney Oof the inner case is flatter and narrower than this box through which itpasses, and the two are riveted together, as in Fig. 1. The sides of thebox project in front and rear of the chimney, and a space is left"between the outer case and the ends of the box, so that air may pass upfreely between the two cases, and between the box and chimney, as wellas between the box and outer case, thus cooling the lantern. The lamp Dslides in ways in the open-ended lamp-chamber, as described in my patentof 1869, abutting against a stop, d, at its front end, and being lockedby a spring-stop, d, behind it.

edges turned up to form springs.

As the lamp fits snugly in its ways it is thus held steadily in itsproper relation to the slotted diaphragm F. The details of the burnerdiffer somewhat from that shown in my patent of 1669, although theprinciples of construction therein set forth are retained. The top E ofthe burner is made of a rectangular pyramidal shape to adapt it to thereception of flat wicks. I A guard, c, of wire-gauze, in the shape of aV,is placed between the burners, which fit within flanges e 6 coveringthe cavity of the struck-up portion f of the slotted diaphragm F. Thepurpose of these guards is freely to admit air to the flame, and yet toprevent flickering. An upright narrow strip, f, of glass, in front ofthe rib f, serves to protect the front glass of the flame-chamber fromheat. The ends of the inner case or flame-chamber are closed by glassesG H, held in place by springcatches g g. The reflector I is pivoted tothe outer case by a hinge, i, so

' that it may be turned up out of the way when access is desired to theflame-chamber, and yet, being connected with the case, is not liable tobe dropped or misplaced. The rear glass G of the flame-chamber is asimple plate, its office being merely to close the end of the chamberagainst drafts. Air, however, passes up between it and the reflector.The front glass H, being necessarily nearer the flame, is exposed togreater heat than the rear one, and is liable to be cracked. To preventits dropping out of position in such case I mount the glass in a frame,h, of sheet metal, having its The glass is placed in this frame andclamped by a circular spring, It, of wire, which slips inside theflanges. A cracked glass can thus be held in place or easily replaced bya sound one. An air-space, it will be observed, is left between thisglass and the condensinglenses J K, which latter need no description. Aslide-rest, L, is secured to the base in front of these lenses, beingheld in place by a pin and spring-catch, l, somewhat similar to thoseshown in my former patents. A simple holding spring, L, is, however,substituted for the slide-frame shown in those patents.

The objective tube 0 and its shield N are mounted on a frame, M, slidingin ways in the base A, so that these parts may be adjusted relatively tothe lantern proper as desired. The objective tube is made in twosections, connected by a telescopic joint, and movable, one upon theother, by a rack and pinion. Each section carries a proper lens orlenses, united to it by screw-couplings in such manner as readily toadmit of their removal orinsertion. The details of this part of theapparatus, being familiar to Opticians, need not be described.

In order to produce the effects of clouds or coloring I employ a shadeor shades, arranged to slide vertically in ways or guides on theobjective-tube frame, and operated by a suitable handle or lever. Fig. 1shows two such slides, P P, one being intended for red, the other forblue, glass. These slides are controlled, in this instance, byguide-rods'p, passing downward through holes in the frame, and bylifting-rods p, extending upward through the shield N.

As the glass is drawn up the coloring descends on the picture, itsapparent movement being reversed by the lenses, and the effect producedis much more natural than that of a flap of colored glass hinged above,and swinging down over, the tube, as has been proposed.

In order to darken the field I hinge an opaque flap, B, so that it maybe rocked on a pivot, r, in the shield. As this flap swings up frombelow it produces the effect of a pall or curtain descending over thepicture, instead of rising or moving laterally over it, as hasheretofore been the case.

The flaps R and slides P P, it will be observed, are inclosed entirelywithin the shield or hood, and are thus protected from injury, and muchmore convenient to reach than when mtgunted on the front end of the.objective tu e.

The functions and mode of operation of the different devices willreadily be understood from the foregoing description.

I claim 1. In a magic lantern, a color-glass, constructed substantiallyas set forth, to slide upward from below across the line of light,whereby the shade is caused to descend .upon the picture, as set forth.

2. The combination, substantially as set forth, of objective lenses,their supportingframe, and a color glass or shadereciprocating in guidesin said frame outside of the focus of the lantern whereby the effect ofclouding is produced upon the picture.

3. A hinged flap, constructed substantially as set forth, to swingupward from below across the line of light, with its edge within thefocus of the lantern, whereby a sharp line, similar to that caused by afalling curtain is produced when the flap is turned up to shut off thelight from the objective tube.

4. The combination, substantially as set forth, of a lantern-body, anadjustable frame, in which the objective lenses are mounted, a hoodattached to the adjustable frame, and a swinging flap hinged Within, andprotected by, said hood.

5. The combination, substantially as set forth, of a flame-chamber, alamp-chamber, a slotted diaphragm separating the two chambers, a lampthe upper edge of which sits close to the diaphragm, and flanges on thediaphragm overlapping the top of the lamp, to secure astrong draft,while preventing flickermg.

6. The combination, substantially as set forth, of the flame-chamber,the front glass, its spring-frame, and circular retaining-sprin g,whereby the glass, although accidental] y cracked, may be retained inthe frame.

7. The combination, substantially as set forth, of the lamp, theflame-chamber, its front glass, and the heat-deflector plate f arrangedbetween the lamp and glass, whereby the front glass may be brought closeto the lamp with little danger of cracking.

In testimony whereof I have hereunto subscribed my name.

L. J. MARGY.

Witnesses:

JOE I. PEYToN, E. O. DAVIDSON.

